It took me several attempts to get past that part as well until I realized that all you need to do is quickly destroy the three large towers. A couple tips would be to go into your inventory as soon as you start and equip all the dragon armor that you may have. Also if you collected any Dragon skill books (I know I had at least one on me) use it and learn the dragon spirit skill to heal yourself. That and your default fire attack should get you by.
